highway robbery vs valuable

highway robbery

noun
  • Said of excessive or exorbitant prices. 

  • The act of robbing a traveler on a public road. 

valuable

noun
  • A personal possession such as jewellery, of relatively great monetary value. 

adj
  • Having a great value. 

  • Estimable; deserving esteem. 

How often have the words highway robbery and valuable occurred in a corpus of books? (source: Google Ngram Viewer )